scholarly journals Transient Heat Pipe Model Progress Report.

2021 ◽  
Author(s):  
Vincent Mousseau ◽  
Andrew Clark
Keyword(s):  
Heat Pipe ◽  
Progress Report ◽  
Pipe Model

Numerical Study on Flow and Heat and Mass Transfer in Pulsating Heat Pipe

2019 ◽  
Author(s):  
Jian-Hong Liu ◽  
Fu-Min Shang ◽  
Nikolay Efimov
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Heat Pipe ◽  
Gas Phase ◽  
Heat And Mass Transfer ◽  
Mixture Model ◽  
Volume Fraction ◽  
Pulsating Heat Pipe ◽  
Two Phase ◽  
Pipe Model

Abstract Numerical simulation was performed to establishing a two-dimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the Mixture and Euler models, which were unsteady models of vapor-liquid two-phase, based on the control-volume numerical procedure utilizing the semi-implicit method. Through comparing and analyzing the volume fraction and velocity magnitude of gas phase to decide which model was more suitable for numerical simulation of the pulsating heat pipe in heat and mass transfer research. It was showed there had gas phase forming in stable circulation flow in the heating section, the adiabatic section using the Mixture and Euler models respectively, and they were all in a fluctuating state at 10s, besides, the pulsating heat pipe had been starting up at 1s and stabilizing at 5s, it was all found that small bubbles in the heat pipe coalescing into large bubbles and gradually forming into liquid plugs and gas columns from the contours of volume fraction of the gas phase; through comparing the contours of gas phase velocity, it could be seen that there had further stably oscillating flow and relatively stabler gas-liquid two-phase running speed in the pulsating heat pipe used the Mixture model, the result was consistent with the conclusion of the paper[11] extremely, from this it could conclude that the Mixture model could be better simulate the vaporization-condensation process in the pulsating heat pipe, which could provide an effective theoretical support for further understanding and studying the phase change heat and mass transfer mechanism of the pulsating heat pipe.

Thermal Performance of Heat Pipe Drill: A New Simulation Model for Heat Pipe

2005 ◽  
Author(s):  
Tien-Chien Jen ◽  
Quan Liao ◽  
Qinghua Chen ◽  
Longjian Li ◽  
Wenzhi Cui
Keyword(s):  
Heat Pipe ◽  
High Reliability ◽  
Heat Removal ◽  
Simulation Models ◽  
Work Piece ◽  
Drilling Process ◽  
Confined Space ◽  
Machining Processes ◽  
Dry Drilling ◽  
Pipe Model

It is well known that drilling is one of the most difficult metalwork cutting operations, not only from the viewpoint of manufacturing process, but also from the thermal management point of view of the drill. For the drilling process, due to its long time continuous metal-to-metal friction between drill tip edge and work piece, a significant amount of heat is generated on the interface, which is in a confined space compared to other machining processes, such as cutting or milling. This makes it very difficult to keep the temperature of drill tip under a certain but acceptable range since the coolant is unable to penetrate deep enough into the hole. Also, based on the environmental considerations and the cost reduction requirement, the conventional flooding coolant method become highly inefficient and expensive due to high maintenance costs. A new approach, dry drilling method (i.e., no coolant is employed during the drilling process) is investigated in this study. In dry drilling, we used heat pipe technology to accomplish the goal of efficient heat removal from the drill tip. It is heat pipe’s unique and excellent advantages such as, high reliability, supreme equivalent thermal conductivity, flexible adaptability and so forth, that make it possible for dry drilling by combining the drill and heat pipe. From the numerical simulation viewpoint of heat pipe drill, how to correctly model the heat pipe in the drill is one of the crucial tasks because it will directly influence the accuracy of the simulation results. So far, there are few different kinds of simulation models for heat pipe drill and each of them works well in some kinds of special situations. The present paper studied and compared these different simulation models of heat pipe and then proposed a general, simple but robust and more accurate approach to simulate the heat transfer process in the heat pipe drill. Furthermore, this kind of the heat pipe model can be used in many other heat pipe applications.

Verification of a Transient Loop Heat Pipe Model

1999 ◽  
Author(s):  
K. R. Wrenn ◽  
S. J. Krein ◽  
T. T. Hoang ◽  
R. D. Allen
Keyword(s):  
Heat Pipe ◽  
Loop Heat Pipe ◽  
Pipe Model

Heat Pipe Model Accounting for Variable Evaporator and Condenser Lengths

AIAA Journal ◽  
1974 ◽  
Vol 12 (9) ◽  
pp. 1261-1267 ◽  
Author(s):  
C.L. WILLIAMS ◽  
G.T. COLWELL
Keyword(s):  
Heat Pipe ◽  
Pipe Model

The Anti-Gravity Phenomena in EHD Heat Pipe Model

2002 ◽  
Author(s):  
Jiaxiang Yang ◽  
Jiancai Wang ◽  
Chuntian Chen ◽  
Changsheng Yu
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Copper Wire ◽  
Heat Pipes ◽  
Working Fluid ◽  
Dc Voltage ◽  
Pipe Model ◽  
Condensation Section ◽  
Insulating Liquid ◽  
Saturation Vapor

A heat pipe model of electrohydrodynamical (EHD) enhancement heat transfer has been designed and made. The insulating liquid was selected as working fluid and the copper wire whose diameter was 1mm was used as the high voltage electrode. The temperature in the inlet and outlet of both the vaporization section and the condensation section, the saturation vapor pressure inside this model were measured respectively under different applied dc voltage and different tilt angle, that is, the vaporization section was placed higher than the condensation section. The experiment results indicate that the circumfluence between the condensation section and the vaporization section was improved with the increase of the applied dc voltage. Such EHD enhancement heat transfer technology can be practically employed in the heat transfer engineering, and has some reference values for the investigation of heat pipes used in the case of anti-gravity.

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